Is Morty actually really smart?
He’s intelligent and getting smarter. Either he’s got Rick’s genius in his genes and it’s coming out as the show progresses, or Rick is just rubbing off on him, but yes he is.
Is Rick smarter than Morty?
Probably not. You won’t get any straight answers out of anybody but evil Morty is at the very least good competition. Many theorize evil Morty to be a Rick who transferred his mind into a Morty. As for the intelligence of Rick C-137, all Ricks have the same intelligence.